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14-08-2017, 09:05
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#76
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Marine Service Provider
Join Date: Nov 2008
Location: Port Credit, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 7,579
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Re: So, what can go wrong with aluminum?
Quote:
Originally Posted by double u
water can get under any of those, corrosion with trapped water (differential "oxygenation") is inevitable. friends had the alloy of the cockpitsole eaten through under the teak...
nonskid paint is the only thing we'd have
(but due to the near-inavailability of second hand aluminium boats-apart from Ovnis - TNB is going to be GRP)
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Yup ! Google "Poultice Corrosion"
__________________
If you're not laughing, you're not doin' it right.
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14-08-2017, 10:01
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#77
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Registered User
Join Date: Jun 2017
Location: Subic Bay Philippines
Posts: 539
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Re: So, what can go wrong with aluminum?
Just a note and input regarding Tread-master, we used the original Tread-master M manufactured in the UK on a Aluminium work boat and twenty years later there's no reaction or have ever replaced on piece, we used the epoxy two pack recommended glue,
Great Product-guess it all depends as usual on the preparation and quality of laying!or perhaps one of the so called replica's
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08-10-2017, 20:27
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#78
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Registered User
Join Date: Aug 2017
Location: On the water somewhere
Posts: 60
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Re: So, what can go wrong with aluminum?
This is an example of what can go wrong with an alloy boat in the build stage of my recently launched cat from a well known Australian design. Poor welding skill and environmental control leads to voids everywhere and leaks, in this case the integral water tanks in the bilge. What happens when you get a de-registered house builder to build your boat!
My advice to others is to build indoors, employ a skilled fabricator, demand no leaks, grind out and re-weld all voids especially in high load and external areas and withhold final payment until you've performed a sea trial to confirm!
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09-10-2017, 04:51
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#79
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Senior Cruiser

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 51,756
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Re: So, what can go wrong with aluminum?
Greetings and welcome aboard the CF, Farang.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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09-10-2017, 07:37
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#80
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Registered User
Join Date: Jun 2007
Location: Western Caribbean
Boat: 48' Alu Cat
Posts: 218
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Re: So, what can go wrong with aluminum?
Hello Farang,
was your cat build in Australia or in the Philippines? Launched only recently?
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09-10-2017, 17:59
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#81
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Registered User
Join Date: Aug 2017
Location: On the water somewhere
Posts: 60
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Re: So, what can go wrong with aluminum?
Quote:
Originally Posted by GordMay
Greetings and welcome aboard the CF, Farang.
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Thanks Gord, been an avid reader and sailblog member for 10 years. Former boat was a Valiant, but I figured with 2 hulls I could lose money twice as fast!
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09-10-2017, 18:01
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#82
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Registered User
Join Date: Aug 2017
Location: On the water somewhere
Posts: 60
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Re: So, what can go wrong with aluminum?
Quote:
Originally Posted by Seman
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The hull in Australia, the interior in PH.
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09-10-2017, 19:00
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#83
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Registered User
Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,919
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Re: So, what can go wrong with aluminum?
Lamellar Corrosion can affect older aluminum alloys due to the poorer grain structure. I have a few very small patches in the 38 year old aluminium on SP2. And I have heard of it on other similar era boats. Seems the newer marine alloys have this beat.
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09-10-2017, 19:35
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#84
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,554
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Re: So, what can go wrong with aluminum?
Quote:
Originally Posted by Farang
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Hmmm.... that you, Daniel?
Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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09-10-2017, 20:41
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#85
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Registered User
Join Date: May 2017
Location: Scotland
Posts: 874
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Re: So, what can go wrong with aluminum?
Quote:
Originally Posted by Farang
This is an example of what can go wrong with an alloy boat in the build stage of my recently launched cat from a well known Australian design. Poor welding skill and environmental control leads to voids everywhere and leaks, in this case the integral water tanks in the bilge. What happens when you get a de-registered house builder to build your boat!
My advice to others is to build indoors, employ a skilled fabricator, demand no leaks, grind out and re-weld all voids especially in high load and external areas and withhold final payment until you've performed a sea trial to confirm!
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Dreadful welding
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